A dryer that runs but does not heat is usually caused by restricted airflow, a blown safety fuse, or a failed heating component. The dryer may still tumble normally, but clothes remain damp because heat is either not being produced or cannot move through the machine properly.

Before replacing parts, the first thing to check is airflow. A clogged lint screen, blocked vent hose, or restricted house vent line can cause overheating, poor drying, and repeated thermal fuse failure.

Common Causes

1. Blown Thermal Fuse

A blown thermal fuse is one of the most common reasons a dryer stops heating.

The thermal fuse is a safety device that protects the dryer from overheating. If the dryer gets too hot, the fuse blows and cuts power to the heating circuit. In many cases, this happens because hot air cannot escape through the vent system properly.

Common reasons a thermal fuse blows include:

• Clogged lint screen
• Blocked dryer vent hose
• Crushed or kinked vent duct
• Lint buildup inside the dryer cabinet
• Blocked exterior vent flap
• Long or poorly installed vent run
• Poor airflow through the main house vent line

Once a thermal fuse blows, it usually cannot be reset. It must be replaced.

However, replacing the fuse without fixing the airflow problem can cause the new fuse to blow again.

2. Burned-Out Heating Element

On electric dryers, the heating element creates the heat used to dry clothes. Over time, the heating coil can burn out, break, or short.

When the heating element fails, the dryer may still run and tumble, but it will not produce heat.

Signs of a burned-out heating element include:

• Dryer tumbles but does not heat
• Clothes stay damp after a full cycle
• Dryer takes multiple cycles to dry clothes
• Heat works sometimes, then stops
• Visible break in the heating coil
• Burning smell before the dryer stopped heating

Heating element replacement is a common electric dryer repair. The part is usually moderately priced, but labor can increase the total repair cost.

3. Faulty Gas Valve Coils or Igniter

Gas dryers use a burner system instead of an electric heating element. If a gas dryer is not heating, the problem may be the igniter, gas valve coils, flame sensor, or gas supply.

The igniter lights the gas burner. If the igniter fails, the burner will not ignite.

The gas valve coils open the gas valve so gas can flow to the burner. If the coils fail, the dryer may heat briefly at the beginning of the cycle and then stop heating.

Signs of gas dryer heating problems include:

• Dryer tumbles but produces no heat
• Igniter glows but burner does not light
• Dryer heats at first, then stops heating
• Clicking sound without ignition
• Clothes take too long to dry
• Dryer only heats intermittently

Gas dryer repairs should be handled carefully. If you smell gas, stop using the dryer immediately, shut off the gas supply if it is safe, and contact a qualified technician or gas utility.

4. Clogged Lint Screen or Main House Vent Line

Restricted airflow is one of the most important causes of dryer heating problems.

Even if the dryer is producing heat, poor airflow prevents hot air from moving through the drum and out of the house. This causes clothes to dry slowly and can make the dryer overheat.

Common airflow restrictions include:

• Dirty lint screen
• Lint buildup in the dryer vent hose
• Blocked wall duct
• Bird nest or debris in the exterior vent
• Crushed flexible vent hose
• Too many bends in the vent line
• Long vent run with poor airflow
• Exterior vent flap stuck closed

A clogged vent can cause the thermal fuse to blow repeatedly. It can also increase drying time, raise energy costs, damage clothing, and increase the risk of a dryer fire.

Typical Cost Breakdown

Professional Repair Cost

A professional dryer heating repair typically costs:

$150-$400

The final cost depends on the dryer brand, electric or gas model, failed part, labor rates, accessibility, and whether vent cleaning is needed.

Parts Cost

Common dryer heating parts usually cost:

Thermal fuse: $10-$25

Heating element: $40-$150

Other parts, such as gas valve coils, igniters, thermostats, and flame sensors, vary by model.

What to Check Before Calling a Technician

Step 1: Clean the Lint Screen

Remove the lint screen and clean it completely. The lint screen should be cleaned before or after every load.

If the screen has waxy buildup from dryer sheets, wash it with warm water, dish soap, and a soft brush. Let it dry fully before reinstalling it.

Step 2: Inspect the Dryer Vent Hose

Pull the dryer away from the wall and check the vent hose.

Look for kinks, crushed sections, loose connections, heavy lint buildup, tears, or long twisted vent routing.

Straighten the hose if it is kinked. Replace it if it is crushed, torn, or packed with lint.

Step 3: Check the Exterior Vent

Go outside and inspect the exterior dryer vent while the dryer is running. You should feel strong airflow coming from the vent.

If airflow is weak, the vent line may be clogged. Also check that the exterior flap opens freely and is not blocked by lint, leaves, snow, debris, or a bird nest.

Step 4: Run a Heat Test

After cleaning the lint screen and checking the vent, run the dryer on a heat cycle.

If the dryer heats normally after airflow is restored, the issue may have been a clogged vent or lint screen.

If the dryer still does not heat, the issue may be a blown thermal fuse, burned-out heating element, failed igniter, bad gas valve coils, thermostat issue, or wiring problem.

Step 5: Identify Whether the Dryer Is Electric or Gas

For an electric dryer, common no-heat causes include a burned-out heating element, blown thermal fuse, faulty high-limit thermostat, bad cycling thermostat, or power supply issue.

For a gas dryer, common no-heat causes include a faulty igniter, bad gas valve coils, blown thermal fuse, flame sensor issue, or gas supply problem.

Important Safety Note

Do not ignore dryer vent cleaning.

A blown thermal fuse is often a symptom of poor ventilation. If the vent system remains clogged, the replacement fuse may fail again. More importantly, lint buildup can create a fire hazard.

Clean the lint screen regularly, inspect the vent hose, and make sure the outside vent has strong airflow.

Bottom Line

A dryer that is not heating is commonly caused by a blown thermal fuse, burned-out heating element, faulty gas dryer ignition part, or restricted airflow. Start by cleaning the lint screen and checking the full dryer vent path. If airflow is good but the dryer still does not heat, the problem is likely an internal heating component that needs testing or replacement.